The Garden Club of the Back Bay’s program theme this year, “Water, Water Everywhere, and Not a Drop to Drink,” could have inspired author Eamon McCarty Earls and his presentation at Tower Hill Botanic Garden, 11 French Drive, Boylston, Massachusetts on Saturday, January 8, from 1 pm – 2 pm.  He will discuss his new book on the history of Wachusett Reservoir – Wachusett: How Boston’s 19th Century Quest for Water Changed Four Towns and a Way of Life.  Mr. Earls became interested in the Wachusett Reservoir after a visit a few years ago and began his research when he learned there wasn’t really too much else published about it.  He mined information in local historical societies and libraries, and the result is this interesting and very readable book.  Please join the Tower Hill staff as he discusses his work and shares some of the maps and images in the Tower Hill Library (which overlooks Wachusett Reservoir, as it happens.)  Copies of the book will be available for purchase.  The program is free with admission, and there is a snow date of January 22.  For directions and more information, log on to www.towerhillbg.org.